在进行嵌入式开发时，会遇到一个名词bootloader,这个东西不太好懂，不要说自己写bootloader，就是能看懂别人的bootoader都比较困难。本文详细的介绍了bootloader的原理，回答了什么是bootloader，为什么要用bootloader。看到后，希望您能知道什么是bootloader。(In embedded development, you will encounter a noun "bootloader", this thing is not easy to understand, do not say you write bootloader, that is, to understand other people's bootoader are more difficult. This article describes in detail the principle of bootloader, answer what is bootloader, why use bootloader?. After seeing it, I hope you know what bootloader is.)